The Journal 8 min read
Cabo Water Temperature by Month (And When the Sea Is Actually Swimmable)
Month-by-month sea temperatures for Cabo, plus the surf, wind, and seaweed context that decides whether the water is pleasant, not just warm.
By The One Happy Aruba Team · Updated Oct 2, 2026 · How we know
Bottom line: Cabo's sea is warmest from July through October, when it typically sits in the low-to-mid 80s Fahrenheit and feels like a bath, and coolest from January through April, when it typically runs 68–73°F and a thirty-minute snorkel wants the wetsuit the boat hands you. Nobody needs a wetsuit to swim off a beach here; plenty of people need one to snorkel in February. And the temperature is only half the question: whether you can get in the water at all depends on which coast your beach faces, and that does not change with the season.
Here is the month-by-month table, then the coast-by-coast reality that the table cannot show.
The one-paragraph answer
The Sea of Cortez side, where every swimmable Cabo beach sits, runs on a lag behind the air. The desert air is hot by May; the water does not follow until June and does not peak until August and September. The air cools quickly in November; the water holds the upper 70s into late November and does not bottom out until February and March. So the "warm sun, cool sea" months are April through June, and the "warm sea, cooling air" months are October and November, which is why November is quietly the best month on the calendar for being in the water. A rash guard matters year-round for sun, not warmth. A wetsuit matters only for long snorkels December through April, and the tours supply them.
Water temperature by month
Sea temperatures below are typical ranges for the Cabo San Lucas and Corridor coast, drawn from published climatology rather than our own sensors; expect a degree or two of variation in any given year. Air temperatures are from our month pages. Seaweed is not a factor in Cabo at any time of year: every beach in our data rates sargassum as none, and we have left it out of the table for that reason.
| Month | Sea temp (°F) | Sea temp (°C) | Air high / low | Sea conditions |
|---|---|---|---|---|
| January | 69–72 | 21–22 | 77 / 58 | Calm on both coasts, gentle wind, dry; cool for long snorkels |
| February | 68–71 | 20–22 | 78 / 58 | Coolest water of the year; calm seas, whale season in full swing |
| March | 68–71 | 20–22 | 80 / 60 | Still cool; the breeziest dry-season month, choppier afternoons |
| April | 69–73 | 21–23 | 83 / 62 | Winds ease, glassy mornings; water warming slowly |
| May | 72–75 | 22–24 | 86 / 65 | Calm seas, light breeze; snorkel boats run smooth |
| June | 75–79 | 24–26 | 90 / 70 | Warm and calm; Pacific storms far offshore barely reach the Cortez side |
| July | 79–82 | 26–28 | 93 / 74 | Bath-warm; humidity climbing, quick afternoon thunderstorms begin |
| August | 81–84 | 27–29 | 94 / 75 | Warmest water; humid, heaviest rain chance, hurricane window open |
| September | 82–85 | 28–29 | 92 / 74 | Peak warmth and peak storm risk; still, humid, wettest month |
| October | 79–82 | 26–28 | 89 / 70 | Still warm; calm most days, lingering hurricane risk early in the month |
| November | 75–79 | 24–26 | 84 / 64 | Warm water, cooling air, breezes return; the sweet spot |
| December | 71–74 | 22–23 | 79 / 59 | Calm seas, dry air, ideal boat weather; water cooling fast |
Two things to read off the table. First, March is the month that surprises people: the air says beach weather, the water is at its coldest, and the wind is at its most persistent, so afternoon boat trips are bumpier than in any other dry-season month. Second, the warmest water comes with the worst weather. August and September give you 84°F seas and the highest hurricane risk of the year; our hurricane season guide explains what that risk actually looks like and how to book around it.
Coast by coast: warm is not the same as swimmable
Cabo sits where the Pacific meets the Sea of Cortez, and the water temperature is roughly the same on both sides. The swimming is not. The Pacific-facing beaches have rip currents and a shore break that kill swimmers every year, in every month, and no lifeguards. The sheltered coves on the Sea of Cortez side are calm enough to swim in year-round. The full explanation is in why you can't swim at most Cabo beaches; here is how it maps onto the beaches in our data.
| Beach | Side | Swim safety | When it is good |
|---|---|---|---|
| Medano Beach | Cortez, Cabo San Lucas | Safe; lifeguards, designated swim areas | Every month; the calm town beach |
| Santa María Beach | Cortez, Corridor | Safe; sheltered Blue Flag cove | Every month; clearest November–May |
| Playa de los Amantes | Cortez face at Land's End | Caution; boat traffic, no lifeguards; the Pacific face (Divorce Beach) is prohibited | Calm mornings, any month |
| Playa Cabo Real | Cortez, San José side | Caution; open coast, seasonal surf, no lifeguards | Calm dry-season mornings only |
| East Cape Beach | Cortez, East Cape | Caution; remote, variable | Summer and fall when the Cortez is warmest and flattest |
| Playa Los Cerritos | Pacific, Todos Santos | Safe; gentle beach break, the one Pacific beach where swimming works | Any month for a dip and surf lessons |
| Playa Grande Cabo | Pacific, Cabo San Lucas | Dangerous; rip currents and shore break | Never for swimming |
| Playa Buenos Aires | Pacific side | Dangerous; strong currents and shore break | Never for swimming |
| Cabo San Lucas Beach | Pacific, Cabo San Lucas | Dangerous; deadly rip currents, swimming prohibited | Never for swimming |
The pattern is simple. If the beach faces the Pacific, the water temperature is irrelevant because you are not going in. If it faces the Sea of Cortez and sits in a cove, you can swim in it in February in a wetsuit or in September in nothing but sunscreen. If it faces the Cortez on open coast, like Cabo Real or the East Cape, the dry-season swell makes it a caution beach in winter and a decent one in the warm, flat months of summer and fall.
One seasonal wrinkle on the Pacific side: winter brings bigger swells, which is good for surfers at Cerritos and bad for anyone standing near the waterline at Playa Grande. Summer flattens the Pacific somewhat, but "flatter" on that coast still means no swimming, and the resorts there say so in the room.
Best months by what you want to do
Snorkeling. The tradeoff is warmth against visibility. The clearest water in the coves is November through May, when the sea is cooler and the plankton thinner; the warmest water is July through October, when it is often greener. The compromise months are November and early December, when the water is still 75–79°F and the visibility has come back, and May, when it is warming through the low 70s and the mornings are glassy. If you are going out December through April, wear the wetsuit, go on the earliest boat, and expect a bumpier ride in March. Our snorkeling spots ranked guide has the sites and the boats; the Chileno and Santa María hub covers the two best coves.
Kids in the water. Warm, calm and watched is the order of priorities, and that means Medano in the Sea of Cortez months from May through November, when the water is above 72°F and small children stop shivering after ten minutes. Santa María is the quieter version with no lifeguards, so it is for families who are comfortable supervising. In the winter months, the pools are warmer than the sea and most kids vote for the pool. The Cabo with kids guide has the resort side of that decision.
Surfing. The opposite calendar. Cerritos near Todos Santos and the East Cape breaks work year-round, but the Pacific swell is biggest in winter and the East Cape's summer south swells are the ones serious surfers travel for. Water in winter at Cerritos is cool enough for a spring suit; in summer it is trunks. Ask a local shop about the day's conditions; the Todos Santos area page has the lay of the land.
Whale watching. Not a swimming activity, but it is the reason the cool-water months are so popular. Humpbacks and grays are in the bay from roughly mid-December through March, which is exactly when the sea is at its coldest. Dress for the boat, not the beach; the whale watching hub covers the season.
Boat days and sunset sails. December is the month our data flags as ideal boat weather, with calm seas and dry air before the winter swells build, and May is its mirror in spring. The sunset cruises hub lists the trips.
Whale sharks in La Paz. A two-hour drive from Cabo, in a protected bay, with a season that runs roughly October through April. The water in La Paz runs a touch cooler than Cabo's and the tours provide suits; see La Paz whale sharks and sea lions.
Picking your month
If the sea is the point of the trip, book November, late October or May: warm enough to stay in, calm enough to get out, and without the humidity and storm risk of high summer. If you want the warmest possible water and can live with heat, afternoon storms and a flexible booking, August through early October gives you 82–85°F seas and the emptiest beaches of the year. If you are coming for the whales and the dry-season sunshine, January through March is lovely and the water is a wetsuit affair; plan to be on boats and by pools rather than floating for hours.
Each month page in the month-by-month guide has the air, wind and rain picture alongside what is happening on the water, and the beaches page carries a swim-safety note for every beach we track. If you would rather we match the month and the resort to how much of the week you want to spend in the sea, the planner asks exactly that.